Visit Arizona's national parks for free April 22 - 26

National Park Service (NPS) employee Bill Dabney leads a pack of mules loaded with tools and supplies on June 9, 2009 into in Grand Canyon, Arizona.

John Moore

Copyright Getty Images

From April 22 to April 26, every national park in the country is offering FREE admission. It's National Park Week. National parks are a good deal any time of the year – especially as 268 of the 401 national parks never charge an entrance fee.

It costs $25 to get into Yellowstone. But that's good for a car full of people and for up to a week of exploration. Still, if you're planning a family trip, hitting popular parks like Grand Canyon, Bryce Canyon, and Zion, you'll save $75 if you go next week.

All year long, you can buy an $80 National Park Pass that gives you a year of unlimited admission.

There are a few other free days this year:

August 25 - the birthday of the National Park Service

September 28th, National Public Lands Day

Veteran's Day Weekend in November

Crowds will obviously be a little bigger during National Park Week, but there are also special programs put on by on the rangers. Check nps.gov for the details on your favorite park.